I just KNOW that you want to KNOW those original dimensions !! Here goes…
On the friction plates there are 42 inserts on each one, 1/2″ diameter x 1/4″ thick.
On the chainwheel/basket there are 40 inserts 9/16″ diameter x 3/8″ thick.
While I am ‘at it’ please note that the clutch runs on 36 bearing rollers that are 3/16″ X 3/16″